I saw this in a Spanish forum, which isn't exactly the most reliable source..
Was this picture of a LGBT protest march digitally faked?
This image shows the banner of a group called LGBT Against Islamophobia. The specific image was taken at Birmingham Pride in 2015, but they were also at other prides such as London Pride.
Personally, I agree that it may seem a bit odd to focus on religious discrimination or racism at pride, but I see no irony in one oppressed group being against the discrimination of a different oppressed group.
It seems that an implied question here is if islam is especially homophobic - for example compared to christianity. One source to answer this would be the Pew Research Center. In 2014, 45% of muslims said that homosexuality should be accepted by society, compared to 62% overall, 54% christian, 36% evangelical, 81% jewish, or 94% atheists.
Unlikely, there are many sites showing photographs of the same banner being held by different people.
Here is a screenshot of search results to exemplify:
These pictures come from widely dissimilar websites like
... to name a few.